changed config file
adding docstrings
changed twitter history querying methods
made some changes
Merge branch 'db' of https://github.com/lnhubbell/tweetTrack into db

Conflicts:
	streamScript/twitter_stream.py
fixed bugs in DB script, querying twitter history script
refactored sending tweets to DB; pulled Twitter keys into a separate file
refactored spaghetti function:
updated stop_cities
added docstrings
added reference papers
removed print statement
add imports
set sql limit and pickle dataset
wrote build matrix and build vocab functions
pickle the X and Y arrays
fixed password
finished merge and removed the pickles which were too big for github
Merge branch 'db' of https://github.com/lnhubbell/tweetTrack into db

Conflicts:
	streamScript/locations/prep_training_data.py
	streamScript/send_data.py
Merge branch 'db' of https://github.com/lnhubbell/tweetTrack into db